<template>
    <!-- 底部 -->
    <div class="my-footer">
        <!-- 全选 -->
        <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="footerCheck" v-model="isAll">
            <label class="custom-control-label" for="footerCheck">全选</label>
        </div>
        <!-- 合计 -->
        <div>
            <span>合计:</span>
            <span class="price">¥ {{ allPrice }}</span>
        </div>
        <!-- 按钮 -->
        <button type="button" class="footer-btn btn btn-primary">结算 ( {{ allCount }} )</button>
    </div>
</template>

<script>
export default {
    props: ['arr'],
    computed: {
        isAll: {
            set(val) {
                this.$emit('changeAll', val)
            },
            get() {
                return this.arr.every(obj => obj.goods_state === true)
            }
        },
        allCount() {
            return this.arr.reduce((sum, obj) => {
                if (obj.goods_state === true) {
                    sum += obj.goods_count;
                }
                return sum;
            }, 0)
        },
        allPrice() {
            return this.arr.reduce((sum, obj) => {
                if (obj.goods_state) {
                    sum += obj.goods_count * obj.goods_price
                }
                return sum;
            }, 0)
        }
    }
}
</script>

<style lang="less" scoped>
.my-footer {
  z-index: 2;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  background: #fff;

  .price {
    color: red;
    font-weight: bold;
    font-size: 15px;
  }

  .footer-btn {
    min-width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 25px;
    padding: 0;
  }
}
</style>